Necessity & sufficiency

The only thing I remember from Logic classes in first year Philosophy was 'necessity' and 'sufficiency' in conditional statements.  Of course in the years since then I've somewhat purposefully mutated the terms, adapting them to marketing consulting.  For example: -

For a product launch to be successful it is necessary to have a good product but that alone is not sufficient

This is more than a rhetorical device.  It helps keep a client discussion focused on those factors that have to be in place before starting a project; the genuine deal-breakers.

This is easily applied to staging of comedy night: -

For a comedy night to be successful it is necessary to have a functioning microphone and a decently lit performing space and whilst these alone are not sufficient, without them you're just another guy standing, yelling in the middle of the pub 

 What?  Quit showbiz?